标点手性
Punctuated Chirality
摘要：
大多数生物分子以彼此的镜像或手性图像出现。然而，生命是同手性的：蛋白质几乎只含有左旋（L）氨基酸，而RNA和DNA中只含有右旋（R）糖。生命的这种基本不对称性背后的机制仍然是一个悬而未决的问题。耦合时空演化的一般自催化聚合反应网络的外部环境的影响，我们通过详细的统计分析表明，高强度和长时间的事件可能会驱动非手性的初始条件对手性。我们认为，生命的同手性是由环境事件引发的连续手征对称性破缺引起的，从而将间断平衡理论扩展到了生命前的领域。将我们的论点应用于其他可能承载生命的行星平台，我们预测，统计上具有代表性的样本平均将是外消旋的。
英文摘要：
Most biomolecules occur in mirror, or chiral, images of each other. However, life is homochiral: proteins contain almost exclusively levorotatory (L) amino acids, while only dextrorotatory (R) sugars appear in RNA and DNA. The mechanism behind this fundamental asymmetry of life remains an open problem. Coupling the spatiotemporal evolution of a general autocatalytic polymerization reaction network to external environmental effects, we show through a detailed statistical analysis that high intensity and long duration events may drive achiral initial conditions towards chirality. We argue that life's homochirality resulted from sequential chiral symmetry breaking triggered by environmental events, thus extending the theory of punctuated equilibrium to the prebiotic realm. Applying our arguments to other potentially life-bearing planetary platforms, we predict that a statistically representative sampling will be racemic on average.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
